Valve and method of manufacture



' imV Patented Sept. 22, 1931 e umane-merma' von emceeoflnmmorsf 4 A Y'. Application `med November 2l,4 .*Se'ar Rio.

This inventionrelatesto'valves .or analog'ous headed devices 'and' more particuarly to valves formed of a single piece adapted for luse -i'n internal l'combustion` engines. Among the "novel features of this invention 'aree-the provision'of a single-piecevalve with 'al hollow stem which may' contain a suitable. salt` or heat transferring material, 'preferably one of such nature which a'solidv at ordinaryv tem-- [loi peratures butbeeomesliquid under relatively high temperatures; the provision of a singlepiece valve having the head formed on the stem in such a manner as to permit a certainv amount of give or `resiliency Whenthe head {l5} strikes the seat; and the methodof manufacturing valves of this character whereby the heat transferring salt or the like may be securely enclosed inthe hollow stem Without the necessity of closing the plugs or the like.

(2U. The objects of this invention are to provide an improved valve of the character indicated to provide a valve having its stem and head formed of a single piece and constructed 1n such manner as to give more or less resiliency 125 or yielding of the head; to-provide a valve having a hollow `stem with heat transferring material therein; to provide `an improved method of manufacturing valves; and to provide such other novel features and improve- 30 ments in construction as will appear more@ fully hereinafter.

In the accompanying drawings, Figure l is a side view of the stock or*4 rod from which the valve is to be formed and also showing in dotted lines a preliminary forming or gathering operation; Y

Figure 2 is a sectional view of the stemv and partially formed head shown in position in the forming dies; o 1

Figure 3 is a view similar to Figure 2 showing the next step in the forming operation and also indicating in dotted lines the hole which is drilled into the stem after such operation;

succeeding operation which closes the end'of the hole after the heat transferring salt or material has been placed therein; and

Figure 5 is a sectional view showingthe jin-Vanvdj thereupon the upper endofthe valve ',headjfisfheated jfustl :sueient forv the next formingfoperation, as, in Figure 4; In

Figure l is a similar view showing the next finalfoperationfandalso showing the. com, pletedvalve. I f Y v 1Inf-accordance z i 'ththis invention, the valve is made from a rod or piece of stockf which may first kbe subjected to. a preliminary '55 gathering operation to form a conical end, asshown in dottedlinesat 7 in Figure l; The stem Ywith, this conical endis` then. subjected to-` the action of dies`8 and 9', as shown in 'Figure 2to malretheY next forming operas. "gb tion, All of the lower forming dies have, up- Warllly extending central conical prejections,V 'asshownat. my which serve to form Vafrecess "inV the'head: around theV upper` portion o the ls'tenn. i This second operation'- shortens: the c5 partialrllyformed conical'head and increases its diameter.2 y After this loperatiomthe; pax',- tiallyrformed valve subjected to the. notion oflcliesllA and 12; which' are Similar to Vthe rpreceding"dies: and intended to further' widen V"fo and shorten the aheadgas clearly l shown in jeetiom` T14v be farmed on .the uppery S noe .of thefvalverhead; 4VAlfter-athis operation a :lm'olel 115 through the head: and stem, m'sfindicatedin--dotmd'lines in l5`-g11re V:This rnnzayV cmd downwardly?y any V.desirevzl distance, but. preferably terminates at. a point abouty opposite .the lower: end of the guide. vvvso of drillingthe hole from ,the top,

it maybe: made comparatively 'shnrtamsl consequently is much cheaper to drill thani the -lwle were drilled from theV bottom oet thestem to the upper end thereof, as it is well'known heattransferring ymaterial 16' is placed therethistoperati-on the valve' 'is subjected tothe action of dies 17 and 18 which forces theirafu', y itrilof the proj 14 into the upper end ofthe helgfafs shewi'rat 19, thereby complete- I 513e @enligne ena tiene here. This m11; vse'althrall lfmitferiali"inetllev S0;- thatiii j vrilll` i" Y Iiob detrimental. the z forming; oper-'i aoc v ation which requires a comparatively high degree of heat. Y After the end of the hole has been closed, the head and adjacent portion of the stem kkis heated to a sufficiently high temperature to permit the final forming operation, as shown in Figure 5. In this operation the stem and head are subjected to the action of dies andV 21 which are ',Of suitable conformation to complete the desired formV of head. Duringthis operation the downwardly vextending -flange-like`l yprtior! '22 of the partially formedhead, as shownin Figure 4, is folded or pressed inwardly against the adjacent portion of. the stem, and the upper part of the blank is further coinpressedand forced downwardly' into the end ofthe hole, thereby further tending toV com pletely seal`v or close thesame.` This operation causes ajoint or separation 23 which extends outwardly from the stem into the head, as shownin liligure- 5, which tendsvto permit a certainamount of yielding or resiliency. for

` the head with respect to the same so thatthe Y fin valve-Will have a lcushioning effect at the vtime of impact with the valve seat or motor blocks.

From this description it win besten that I i provide a single-piece valve having ahollow estem, and the material placed therein will be .securely -sealed `against any possibility: of leakage. VIt will, however, be noted thatV difandupper lportion are continuous with the stem, withaseparating surfe/ce between said central portion and the lower part of the surrounding portion, said se arating surface extendingroutwardly `into vt e head beyond the Stem.; Y

A 6.y A valve comprising ahollow stem in its upper portion, an integral head on said stem,

said head having a surface of separation extending outwardly from the stem -intothe body thereof, to permit a yielding action between the head and stem.

` MICHAEL J. BOYLE.A

Yferent types ofvalvesmay require different Y. characteristics,as,V for instance, some changes o 'may be desirable'in the details of construction 4to :adapt the valve foreither intake, oreX- A. haust ports; Vtherefore Ido not wish to be .Y Y :limited to-fthe exact' construction herein o :sion 23emay be lessened in extent or omitted, Vas'could readily be done by leaving out'the -shown ande-described. AFor instance, if `a. t i Y `more rigid head is desired, the joint ordiviprojection 1() inthe forming dies. It will i :also be noted` that moreor less gathering or drawing'operations'may benecessary` for dif- E r `Having thus described my invention, what I claim and desire to secure by Letters Patent is: Y

1l. yA single-piece valve and stem'having a the stern outwardly vinto the headik w 4 2. A valve comprising a stem having an in- .-ferent sized valves or for 'different materials; i l y l therefore the exact number of such operations visnot criticalin the present invention.r

'separation extending from the upper end of v ytegrally formed'head, ythe head having a Ylz'tnge-lilre inwardly-extending portionwhich i lies closely against vthe upper portion and 1 `'which engages with the upper end of AYthe .sam-L f Avalve ofthercharacterlset forth having Y Y.a headv comprising two integrally kformed 12; i

ithicknessesfofzmetal,l one thickness projectfing outwardly fromthef end of the stem and forming? the .principal central portioutof the 1a-;

tra@ 

